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We all have those times in life where change comes and as we take time to reflect on what's going on we often have those "ah ha" moments.
I think these are what is called an Epiphany: [i-pif-uh-nee]
:a sudden, intuitive perception of or insight into the reality or essential meaning of something, usually initiated by some simple, homely, or commonplace occurrence or experience.
In Rex's case it's an "oh no" moment.